Photo backup for whole Camera Roll won't start at all.

Steps to reproduce

1. Have more photos in iCloud than fit in your iPhone.
2. Enable backup of whole camera roll.
3. It takes forever and never finished.

Expected behaviour

I hoped it will upload photos in smaller batches. But I get it might be complex, as a workaroud I'd accept better image picker when uploading, at least more elements on screen, so I could select more photos at once, or select whole month at once. I don't mind going throught that process. But I have 25K items in my phone over the years and it would take forever to go throught everything and select one by one. Please add at least a better image picker.

Actual behaviour

Backup never starts uploading anything

Screenshots

Just loading popup on settings screen.

Logs

No logs applicable

Reasoning or why should it be changed/implemented?

I consider this an absolute neccessity to enable smooth transfer from one cloud to another.

Environment data

iOS version: e.g. iOS 14.7.1

Nextcloud iOS app version: 4.0.6.0

Server operating system: Nextcloud pi in linux docker image

Database: Maria DB or something

PHP version: does'nt matter.

Nextcloud version: 22.1.1 but it also happened on previous

Start by reproducing the whole-camera-roll backup from the settings screen, then trace the camera-roll backup and image-picker flows. The issue offers two possible outcomes—making large backups upload in batches or improving selection with more items or whole-month selection—so completion requires clarifying the intended scope and verifying that backup no longer remains stuck without uploading.